springBoot框架搭建整合jpa

谁借莪１个温暖的怀抱￠ 2021-12-22 13:23 388阅读 0赞

1.通过 https://start.spring.io/ 选择项目需要的技术，生成响应的项目。

2.springboot启动类，配置

@ComponentScan 扫@Controller，@Service，@Repository，@Component的包路径

@EntityScan  扫@Entity的包路径

@EnableJpaRepositories 扫JPA的包路径

@SpringBootApplication
    @ComponentScan({
         "com.example.springboot.controller", "com.example.springboot.dao", "com.example.springboot.service"})
    @EntityScan(basePackages = {"com.example.springboot.entity"})
    @EnableJpaRepositories(basePackages = {"com.example.springboot.dao"})
    public class SpringbootApplication {
    
      public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
      }
    
    }

3. 配置applicaiton.properties

########################################################
    ###datasource
    ########################################################
    spring.datasource.url = jdbc:mysql://localhost/test?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8
    spring.datasource.username = root
    spring.datasource.password = pt891209
    spring.datasource.driverClassName = com.mysql.cj.jdbc.Driver
    spring.datasource.max-active=20
    spring.datasource.max-idle=8
    spring.datasource.min-idle=8
    spring.datasource.initial-size=10
    ########################################################
    ### Java Persistence Api
    ########################################################
    # Specify the DBMS
    spring.jpa.database = MYSQL
    spring.jpa.show-sql = true
    #jpa 可以根据entity反向创建表
    spring.jpa.hibernate.ddl-auto = update  #true会根据entity反向映射到数据库表中
    spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy  #Jpa 支持头封命名
    spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

4.编写controller,service

@RestController
    public class TestController {
    
      @Autowired
      private TestService testService;

@RequestMapping("/test")
    List<UserEO> index(){
        
      List<UserEO> users = testService.findUsers();
      return users;
    }

}

service

@Service
    public class TestServiceImpl implements TestService {
    
      @Autowired
      private UserDao userDao;
    
      @Override
      public List<UserEO> findUsers() {
        return  (List)userDao.findAll();
      }
    }

5dao层 继承

import com.example.springboot.entity.UserEO;
    import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
    import org.springframework.data.repository.PagingAndSortingRepository;
    
    
    public interface UserDao extends PagingAndSortingRepository<UserEO, Long>, JpaSpecificationExecutor<UserEO> {
    
    
    }

6.请求 http://localhost:8080/test

页面响应：

[{"id":1,"userName":null,"password":"fff","createTime":null}]

转载于:https://www.cnblogs.com/ptcnblog/p/10971856.html